Preliminary Observations on Fish Eggs and Larvae Collected During GOA-IERP Cruises in 2010 and 2011
Larvae Spring 2010
Summer 2010
Spring 2011
Clupeiformes
Pacific herring (Clupea pallasi) X
Osmeriformes
Popeye blacksmelt (Bathylagus ochotensis) X
Pacific blacksmelt (Bathylagus pacificus) X X X
Northern smoothtongue (Leuroglossus schmidti) X X X
Capelin (Mallotus villosus) X
Stomiiformes
Pacific viperfish (Chaulodius macouni) X
Unidentified hatchetfish (Sternoptychidae) X
Myctophiformes
Chubby flashlightfish (Electrona risso) X
Northern flashlightfish (Protomyctophum thompsoni) X X X
Northern lampfish (Stenobrachius leucopsarus) X X X
Gadiformes
Pacific cod (Gadus macrocephalus) XWalleye pollock (Theragra chalcogramma) X X
Scorpaeniformes
Sablefish (Anoplopoma fimbria) X XScalyhead sculpin (Artedius harringtoni) X X
Rosylip sculpin (Ascelichthys rhodorus) X
Gray starsnout (Bathyagonus alascanus) X X
Spinycheek starsnout (Bathyagonus infraspinatus) X
Blackfin poacher (Bathyagonus nigripinnis) X X
Red Irish lord (Hemilepidotus hemilepidotus) X X
Brown Irish lord (Hemilepidotus spinosus) X X
Kelp greenling (Hexagrammos decagrammus) X X
Masked greenling (Hexagrammos octogrammus) X X
Unidentified sculpin (Icelinus spp.) X
Slipskin snailfish (Liparis fucensis) X X X
Darkfin sculpin (Malacocottus zonorus) X
Lingcod (Ophiodon elongatus) X X
Thornback sculpin (Paricelinus hopliticus) X X
Slim sculpin (Radulinus asprellus) X
Puget Sound sculpin (Ruscarius meanyi) X X X
Unidentified rockfish (Sebastes spp.) X X XRoughspine sculpin (Triglops macellus) X
Perciformes
Pacific sand lance (Ammodytes hexapterus) X X
Wolf-eel (Anarrichthys ocellatus) X
Unidentified searcher (Bathymaster spp.) X X
Dwarf wrymouth (Cryptacanthodes aleutensis) X X
Ragfish (Icosteus aenigmaticus) X
Daubed shanny (Lumpenus maculatus) X X
Whitebarred prickleback (Poroclinus rothrocki) X X
Northern ronquil (Ronquilus jordani) X X X
Prowfish (Zaprora silenus) X
Pleuronectiformes
Arrowtooth flounder (Atheresthes stomias) X XRex sole (Glyptocephalus zachirus) X
Flathead sole (Hippoglossoides elassodon) X X
Pacific halibut (Hippoglossus stenolepis) X X
Southern rock sole (Lepidopsetta bilineata) X
Yellowfin sole (Limanda aspera) X
Slender sole (Lyopsetta exilis) X
Dover sole (Microstomus pacificus) X
Eggs Spring 2010
Summer 2010
Spring 2011
Osmeriformes
Northern smoothtongue (Leuroglossus schmidti) X
Gadiformes
Unidentified grenadier (Macrouridae) X X
Walleye pollock (Theragra chalcogramma) X XScorpaeniformes
Sablefish (Anoplopoma fimbria) XPerciformes
Ragfish (Icosteus aenigmaticus) X X
Pleuronectiformes
Arrowtooth flounder (Atheresthes stomias) XPacific sanddab (Citharichthys sordidus) X X X
Deepsea sole (Embassichthys bathybius) X X
Rex sole (Glyptocephalus zachirus) X X X
Flathead sole (Hippoglossoides elassodon) X X
Butter sole (Isopsetta isolepis) X
Yellowfin sole (Limanda aspera) X
Slender sole (Lyopsetta exilis) X X
Dover sole (Microstomus pacificus) X X
Alaska plaice (Pleuronectes quadrituberculatus) X
C-O sole (Pleuronichthys coenosus) X
Spring 2011 (3–17 May)• SamplesfromthiscruisehavebeencountedinPoland,
buthavenotyetbeenverifiedattheAFSC.Abundanceestimateswillsoonbeavailable.
• Larvaeoffourofthefivetargetspecieswerecollected(allexceptPacificcod).
• Eggsfromthreeofthefivetargetspecieswerecollected.
Walleye pollock eggs and larvae were collected. The eggs were collected in deep water on the shelf and at the entrance to Chatham Strait. Few larvae were collected; they were found as far south as Chatham Strait and as far north as Kayak Island.
A few sablefish eggs were collected near the shelf break south of Cross Sound. Sablefish larvae were also collected in the bongo net both on and off the shelf.
The neuston net was a more effective sampling gear for sablefish larvae than the bongo with the distribution of larvae captured being much broader. Larvae were found at many more stations, with the highest numbers generally occurring at the shelf break.
Arrowtooth flounder eggs and larvae were collected along the shelf break and in deep water. The larvae collected this year were larger (9.5 – 22.0 mm) than those collected in 2010 (6.0–12.0 mm).
Most rockfish larvae were collected in deep water; they were ubiquitous and frequently encountered throughout the study area.
Additional Samples for Analysis• FinalverificationoftheR/VThompsoncruise.Length
analysisoflarvae.Estimated Completion: Spring 2012.
• ThespringR/VTiglaxcruisein2011collected47neustonand46bongosamplesontheshelfandattheshelfbreakinthewesternGOA.Estimated Completion: Spring 2012.
• ThesummerF/VNorthwestExplorercollected52neustonand50bongosamplesinthesoutheastand53neustonandbongosamplesinthewesternGOA.Estimated Completion: Summer 2012.
• TherewerefourMOCNESStowsonthespring2011cruise.Preliminarydatafromthesetowsindicatethatwalleyepollockeggsoccurmorefrequentlyinthedeepernets(>200m)andthatalthoughrockfishlarvaeoccurthroughoutthewatercolumn,theywerealsocollectedingreaternumbersinthedeepernets.
Funding provided by the North Pacific Research Board
Spring 2010 (15–24 April)• Ofthefivetargetspecies,onlyeggsofwalleyepollockwerecollected.
ThehighestconcentrationofeggswasNWofCrossSound.
• Larvaeofallfivetargetspecieswerecollected.
• Rockfishwerethemostabundantlarvaecollected,withthemajoritycollectedindeepwater,southofCrossSound.
• Highestabundanceofsablefishlarvaewasattheshelfbreak.
• Arrowtoothflounderlarvaewerecollectedindeepwater.
• LarvaeofbothwalleyepollockandPacificcodwererareandonlycollectedontheshelf.
Summer 2010 (4–22 July)• Noeggsofthetargetspecieswerecollected.
• Ofthefivetargetspecies,onlylarvaeofrockfishwerecollected.
• Thedistributionofrockfishlarvaeinsummerwasdifferentfromthedistributioninspring.Larvaeweremoreabundantontheshelf,NWofCrossSound.Averageindividualsizeoflarvae(4.79±2.86mm)wasnotsignificantlydifferentthanspring(4.93±0.96mm),althoughseverallargerlarvae(10–20mm)werecollectedinthesummer.
Lisa De Forest, Ann Matarese, Jeff Napp, and Miriam DoyleAlaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, WA, USA 98115
flathead sole
southern rock sole
thornback sculpin
red Irish lord
gray starsnout
lingcod
slipskin snailfish
Pacific blacksmelt
northern flashlightfish
Pacific herring
rex sole
walleye pollock
ragfish
deepsea sole
The recommendations and general contents presented in this poster do not necessarily represent the views or official position of the Department of Commerce, the National Oceanic and Atmospheric Administration or the National Marine Fisheries Service.
Emerging Questions Was 2011 unusual in terms of timing of spawning and subsequent development rates of larvae?
• Directcomparisonsbetweenthe2010and2011springcruisesaredifficultduetodifferenttimingofthecruisesandthelatespringbloomin2011.
• Levelsofabundanceandsizerangesofspeciesoflarvaefromthe2010and2011cruiseswillbecomparedtoAprilandMaydatafromthehistoricalsamplingintheWGOA.
How do taxonomic composition, levels of abundance among species, larvae sizes and distribution patterns from the Eastern GOA compare with the western GOA?
• WeanticipatespringWGOAresultswillbeavailableinSpring2012andsummerwesternandeasternGOAresultswillbeavailableinSummer2012.
Overall Species Diversity
